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Neuropathology of 16p13.11 deletion in epilepsy.

Liu, JY; Kasperavičiūtė, D; Martinian, L; Thom, M; Sisodiya, SM; (2012) Neuropathology of 16p13.11 deletion in epilepsy. PLoS One , 7 (4) , Article e34813. 10.1371/journal.pone.0034813. Green open access

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Abstract

16p13.11 genomic copy number variants are implicated in several neuropsychiatric disorders, such as schizophrenia, autism, mental retardation, ADHD and epilepsy. The mechanisms leading to the diverse clinical manifestations of deletions and duplications at this locus are unknown. Most studies favour NDE1 as the leading disease-causing candidate gene at 16p13.11. In epilepsy at least, the deletion does not appear to unmask recessive-acting mutations in NDE1, with haploinsufficiency and genetic modifiers being prime candidate disease mechanisms. NDE1 encodes a protein critical to cell positioning during cortical development. As a first step, it is important to determine whether 16p13.11 copy number change translates to detectable brain structural alteration. We undertook detailed neuropathology on surgically resected brain tissue of two patients with intractable mesial temporal lobe epilepsy (MTLE), who had the same heterozygous NDE1-containing 800 kb 16p13.11 deletion, using routine histological stains and immunohistochemical markers against a range of layer-specific, white matter, neural precursor and migratory cell proteins, and NDE1 itself. Surgical temporal lobectomy samples from a MTLE case known not to have a deletion in NDE1 and three non-epilepsy cases were included as disease controls. We found that apart from a 3 mm hamartia in the temporal cortex of one MTLE case with NDE1 deletion and known hippocampal sclerosis in the other case, cortical lamination and cytoarchitecture were normal, with no differences between cases with deletion and disease controls. How 16p13.11 copy changes lead to a variety of brain diseases remains unclear, but at least in epilepsy, it would not seem to be through structural abnormality or dyslamination as judged by microscopy or immunohistochemistry. The need to integrate additional data with genetic findings to determine their significance will become more pressing as genetic technologies generate increasingly rich datasets. Detailed examination of brain tissue, where available, will be an important part of this process in neurogenetic disease specifically.

Type: Article
Title: Neuropathology of 16p13.11 deletion in epilepsy.
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1371/journal.pone.0034813
Publisher version: http://dx.doi.org/10.1371/journal.pone.0034813
Language: English
Additional information: PMCID: PMC3327721 © 2012 Liu et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This study was supported by grants from The Wellcome Trust (084730), The Medical Research Council, UK (GD400126 and G79059), and the European Commission within the 7th Framework programme, EURIPIDES. This work was undertaken at University College London and University College London Hospital, who receive part of their funding from the Department of Health Biomedical Centre scheme. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Keywords: Adult, Cerebral Cortex, Chromosomes, Human, Pair 16, Epilepsy, Epilepsy, Temporal Lobe, Female, Hippocampus, Humans, Male, Microtubule-Associated Proteins, Mutation, Sequence Deletion, Temporal Lobe
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Clinical and Experimental Epilepsy
URI: https://discovery.ucl.ac.uk/id/eprint/1347200
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